Author Topic: Converting thread pitches  (Read 1153 times)

Offline mklotz

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Converting thread pitches
« on: September 27, 2022, 04:19:06 PM »
Recently I've had occasion to help several people trying to convert thread pitches between metric and inferial.  In the process of documenting this for them, I noticed something that's worth remembering...

Basically, it goes like this:  Whatever you have, metric or inferial, divide it into 25.4 to obtain the other.

A simple units analysis will prove this...

M = metric pitch measured in mm/th(read)
E = inferial pitch measured in tpi [th(read)/inch]

25.4 (mm/in) / M (mm/th) = (25.4 / M) (mm/in * th/mm) = 25.4 / M (th/in) = 25.4 / M tpi

25.4 (mm/in) / E (th/in) = (25.4 / E) (mm/in * in/th) = 25.4 / E (mm/th)

i.e., whatever you've got, E or M, divide it into 25.4 to get the other
Regards, Marv
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https://www.myvirtualnetwork.com/mklotz

Offline Lew Hartswick

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Re: Converting thread pitches
« Reply #1 on: September 28, 2022, 02:02:17 PM »
Interesting point Marv. That the units cancel that way.
   ...lew...

 

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